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(-No Modell) G. B. THAYER.

ELBVATOR.

180,283,831. PatentedAug. 28, 1883.

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G. B. THAYBR.

ELBVATOR.

No. 283,831. Patented Aug. 28,1883.

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ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 283,831, dated August28, 1883. Application filed May 17,1883. (No model.)

To ctZZ whom it may concern Be it known that I, GEORG-E BURDER THAYER, acitizen of the United States, residing at Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in Elevators; and Ido hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesaine, reference being had to the accompanying drawings, and to lettersor iigures of referenee marked thereon, which form a part of thisspecification.

This invention relates to means for doing away with much of thecomplicated and eX- pensive machinery now employed to operatepower-elevators, as, well as to' obviate the abrupt and jerky motionsnow so common in this class of elevators.

My invention consists in certain details of mechanical construction, ashereinafter explained.

The drawings accompanying this specification represent, in Figure I, avertical section, and in Fig. 2 an elevation, of an elevator containingmy improvements.

In these drawings, Figs. l and 2, A represents the frame of thestructure or the cornerposts of the well, which consists of uprightbeams B B B B, which constitute the guides of The car is shown in thisinstance as i the car. adapted to freight purposes, and composed ysimplyof a platform, D, upright corner-posts E E E E, spanned at top byhorizontal rails F F F F. Upon opposite top rails, E F', of the car Isecure standards G G, and in these standards I journal the ends of ashaft, H, and to these ends of said shaft H, Isecure twin wheels I I',grooved in their peripheries. The wheels I I may be pivoted directly tothe rails F F and the shaft H omitted. Upon the framework of theelevator-shaft, adjacent to the wheels I I above named, I dispose acounterweight frame, .I J, of usual form, which slides upon verticalways a a, secured to the adjacent corner-beams, B B, these framescarrying adjustable weights b b in such number and of such weight as maybe deemed necessary in each instance. Uponthe top of each frame J J,

I erect standards c c, and in each of these standards I pivot a groovedwheel, d or d. Upon opposite sides of the top of the frame A, and

over the wheels I (l I df, respectively, I ere'ct standards K K, inwhich I journal the ends of 5 5 leys, and led about such wheels andpulleys, las follows, taking as a starting-point the )t 'shown on onepulley, e, in Fig. l of the drawings:

From this point l the rope on each side of the structure passes down, asshown by the 'numeral 10(011 the side denoted by the numeral 20,) to andabout the wheel d, thence upward on the opposite side, as, shown bynumeral 11, to and about the lesser groove f',

thence downward on the same side as at iirst, .as shown by numeral12,150 and about the wheelI, thence upward on the opposite side thelatter, as shown by numeral 13, to and about the larger pulley c, thuscompleting the round of the rop'e.

The operation of this device is as follows: Supposing the driving-shaftL to be in rotation in the direction of its arrow in Eig. l, the side 13of each rope is winding up on the groove f of large diameter with atendency to raise' the car, while at the same time that this motion ofthe car is taking place the part l() of the opposite side of the rope isunwinding from the smaller groove f about the wheel d, and the part l1ofthe rope upon the same side as part 13 is winding upon the said groovef, to lower the counter-weight at the same rate of speed as theascending car, Simultaneously with the above movements the part 12 ofthe rope is unwinding from the smaller groove f about the wheel I, theresult being that the car travels at arate of speed equal to the meanbetween the circumference of the grooves ff. Rotation of the pulleys e cin the Y ments ofthe rope.

the speeds, due to the differential diameters of the pulleys e e',determines the rate at which the car travels. The greater thediscrepancy in the diameters of the pulleys of each pair the greater thespeed of the car, and vice versa.

The weighted frames perform two functions.

They serve to counterbalance the car, and, in

conjunction with the weight of the car, to cause friction between therope and the pulleys e c', to prevent slipping of such rope. In settingup an elevatorunder my plan the car and counter-weight frames are to beloaded to produce friction upon the rope, accordingto the desiredlifting capacity of such car.

In Figs. 3 and 4 of the drawings I have shown an alternative'construction of my elevator. In this instance I duplicate the pulleys ee e e of Figs. 1 and 2, placing them at the bottom of the structure aswell as at the top, these duplicate pulleys being shown in said Figs. 3and 4 at e2 e2 e3 c3. In this modification I dispense with thecounter-weights and their sliding carriages and secure the two pairs ofidler-rolls to a single shaft, N, journaled in bearings in the top ofthe car, these pairs of wheels being shown at I2 I2 1313. The shaftN isnot essential. It may be omitted and the wheels pivoted to the top ofthe car. To exert the requisite friction upon the hoisting-rope in thismodified construction, I mount the journals of the shafts P or thepivots of the wheels I? I2 I3 I3 of the lower pulleys, ve2 c2 e3 e3, intwin levers Q Q, disposed at the lower part of the well, and uponopposite sides of the car, these levers being pivoted, as shown at g, tocentral posts, hh, in the nelevator-well. The tails of the levers Q Qare weighted according to the intended capacity of the car.

The construction of an elevatornnder my plan, as hereinbefore described,does away with much of the comparatively complicated machinery nowemployed for the purpose, thereby reducing the power required to operatethe elevator, as well as lessening the cost of the latter. rIhe motionof the car is smooth and easy, the abrupt jerky movements frequentlyobserved in elevators as heretofore constructed being entirely avoided.

My object in employing duplicate sets of pulleys and'hoisting-ropes,arranged oneupon each side the car, as shown, is to equalize the draftupon the latter and prevent fall of such car in the event of one of theropes giving out. Any other additional safety device may be used.

In lieu of pivoting the idler-wheels to the car and counter-weights, asshown in Figs. 1 and 2 of the drawings, or jointly to the car, as

shown in Figs. 3 and 4, the said 'idler-wheels may be pivoted jointly toa carriage adapted to slide upon guides secured to upright posts at oneside of the elevator-well, while the differential pulleys are pivoted tothe top and bottom lof the well,.the hoist-rope being secured at one endto this carriage, thence passing upward about a sheave and secured atits opposite'end to the car; or this last-described rope system may belocated in the well above the highest point vreached by the car, thedifferential groove wheels being journaled in suitable-supports and thecarrier of theidlerf wheels traversing horizontal guides.

I claim- 1. In combination with an elevator-carriage and acounterbalanceweight, a differential pulley on the driving-shaft, and anendless suspending rope or chain which passes around the grooves of saidpulley and around pulleys attached to said elevator-carriage and weight,substantially as set lforth. y

2. `As the operating mechanism of an elevator-c'ar provided with acounter-weight, an endless traveling rope passing over the two groovesof a differential pulley or sheave, one

bight Vof the ropev being connected with thev In testimony whereof IafIiX my signature in presence of two witnesses.

GEORGE BURDER THAYEE.V

lVitnesses:

, F. i OURTIs,

S. O. MEANS.

IOO

